Would I be correct to say you are trying to unlock your phone to use a different network sim in it?
Have you asked to get the phone unlatched/unlocked in the My o2 app once you are logged in?
I will tag the o2 gurus who are on duty this afternoon to see if they can help.
@O2Daniel @O2Waqas @O2Emma can one of you try and help
@Koszmar?
Please note, this is not customer services and we cannot access your account. Do not publish personal details (email, phone number, bank account).
Link to our guide on how to contact them can be found here